Rheostat winding machine



Nov. 15,1932. c. HAVLISH 1,887,808

RHEQSTAT WINDING MACHINE Filed Aug. 1, 1924 4 Sheets-Sheet l NOV. 15,1932- c v s 1,887,808

RHEOSTAT WINDING MACHINE Filed Aug. 1, 1924 4 Sheets-Sheet 2 Nov. 15,1932 c. HAVLISH RHEOSTAT WINDING MACHINE Filed Aug. 1, 1924 4Sheets-Sheet 3 Nov. 15, 1932- c. HAVLISH RHEOSTAT WINDING MACHINE FiledAug. 1, 1924 4 Sheets-Sheet 4 210 36'!) Pas/770 Fig. 3 is a rear endView; and Fig. 4 is a front end view of the machine;

Fig. 5 is a vertical longitudinal section taken on the line 5--5 of Fig.2;

Fig. 6 is a vertical transverse section taken on the line 6-6 of Fig. 5;

Fig. 7 is a fragmentary isometric view of a rheostat employing a stripconstructed in accordance with my invention;

Fig. 8 is a fragmentary diagrammatic view indicating the manner in whichthe thread or guiding groove is cut in the edges of the strip;

Figs. 9 and 10 are diagrams indicating in end view the character of theenveloping helix and the enveloping wire;

Fig. 11 is a fragmentary detail view indicating the manner in which thewires are disposed in the grooves;

Fig. 12 is a fragmentary view similar to Fig. 11 showing the dispositionof the current convolutions in the grooves which are cut in the edge ofthe strip;

Figs. 13 and 14 are diagrams illustrating the variation of linear speedof the wire as it is wound upon the flat strip;

Fig. 15 is a graph of the variation of speed due to the radialirregularity of the strip with respect to its axis of rotation asillustrated in Figs. 13 and 14;

Fig. 16 is a fragmentary sectional view of a modification of the windingmachine when the cutting is done by separate rollers;

Fig. 17 is a fragmentary view of the notches cut by the machine shown inFig. 16; and

Fig. 18 is a modification showing the feeding or cutting roller made aseparate piece as distinguished from the roller or rollers that track inthe threads of the stationary nut or hollow lead screw.

Referring first to Fig. 7 l have here shown the elements of a rheostator potentiometer embodying the strip of my invention. This stripcomprises a thin flexible rod 1 of insulating material such as fibre,impregnated paper or other suitable insulating material upon which stripthere is wound in suitable convolutions or turns the conductor 2. Thestrip 1 is preferably bent in arcuate or circular shape and a springfinger 3 mounted on a coaxial shaft 1 is adapted to sweep over the edgesof the coils or turns 2 to make contact therewith. This general form ofcon-- struction is well known and I lay no claim to the rheostat assuch, apart from the novelty in the strip and its method of manufacture.

According to the theory of my invention 1 take the rod or strip 1 andcut upon the edge thereof, grooves corresponding to screw threads whichmay be conceived as envelopor circumscribing the strip as explained inconnection with. Fig. '9. Now the bar or str p 1 is preferably oblong incross section as indicated in 8. I arrange to thread this through a rular threading die,

pedestal 1 supporting the strip by a suitable chuck in the meanwhile andcut helical threads in the narrow face of edge of the strip and in thesegrooves I lay the turns or convolutions of the conductor 2, meanwhilemaintaining a suitable tension upon the conductor to bend and therebyhold the conductor in the strip at the same time. Suitable take-up andguiding means for securing the desired laying of the conductor in saidgrooves is used in addition to the tensioning means.

A machine suitable for performing the operation automatically is shownin Figs. 1 to 6 inclusive. In said machine the frame or base isindicated at 10. From this base I supporta sub-frame 11 which comprisesa plate mounted upon a plurality of posts 12, these posts havingsuitable bolts 13 passed therethrough and to the main frame.

1 Upon the top of the plate 11, I mount a front bearing pedestal 14 anda rear bearing pedestal 15. Suitable bearings of antifriction metal 16and 17 are mounted in the pedestals 1 1 and 15 and a hollow spindle 18is mounted in said bearings. A conical faced clutch member 20 is keyedto the hollow spindle 18 as by means of a taper pin 21 or the like. Theconical face 22 of the cone clutch member 20 is adapted to engage in theconical clutch socket 23 which is formed in the side of the pulleymember 24, which pulley member is mounted by means of an anti-frictionbearing 25 upon said spindle 18. Anti-friction thrust rings or othersuitable anti-friction bearings 26 are arranged to take the axial thrustof the cone clutch member 20 when the clutch parts are in engagement.

The radial face 27 of the clutch member 20 may engage the side of thebearing post or column 14 to act as a brake for stopping the livespindle 18 when it is disengaged from the pulley 2t.

The live spindle 18 is normally held in its extreme left position as vie.ved in 5, to maintain the clutch surfaces out of contact and to holdthe live spindle 18 stationary, a suitable clutch collar 29 beingmounted for this purpose upon the rear end of the live spindle.

The clutch collar 29 bears at its rear end against a cooperating flange30 which is formed upon a ring 31, this ring" being threaded upon therear end of the shank of the chuck 32. A. locking ring 33 is threadedupon the outer end of the shank of the chuck 32 and it is locked inplace by means of the setscrew The clutch collar 35 to the arms of afork lever 3T being fulcrinned at 37 upon a eta or boss 88 wh ch securedof two pi e frame for axial mot-ion.

plate 11. A tension spring 40 is connected hetween the end of the lever89 and the frame plate Ill so as to tend at all times to turn the lever36 in a clockwise direction and thereby shift the live spindle 18 to theright viewed in Fig. 5, engaging the clutch parts and 523 to causedriving of th live spindle.

The outer end of the lever 39 has an operating rod 41 pivoted thereto,as indicated l2, this operating rod leading down. to a pedal lever forthrowin the clutch meni- .her out of engagement an stopping the openation of the device.

The chuck member 32 has a head portion 45 which is set in a counter-borein the head 46 of the live spindle 18. The said chuck 32is armed in twoparts as will he apparent from .i 3 and 5, each part having alongitudinal nutter formed therein, so that when the two are matchedtogether the outer surfaces form a circular cylinder and the innermatchsurfaces define a slot of oblong; cross section for receiving thestrip 1. The strip 1 passes freely throu 'h the slot in the chuck it arod or bar of different contour is to be Wound the corresponding slot oropening at? in the chuck 32 is formed to correspond to the desired crosssection.

thr ad cutting die 48 which may be of any suitable character such as isnow found on market for cutting standard threads, "3 mounted in a frameplate l9, secured as means of the machine screws 50 to a pair short arms51 and 52 formed on the sides the hearingpedestal let. The die 48 maymade in two parts, or it may be made in one unitary piece and itpreferably is a standard commercial die. The die is held in the openingin the frame plate 49 as by means of the set screw 51, which serves alsoto prevent die turning in the frame 49. The of the die l8 is accuratelyregistered the axis of the slot 47 to facilitate cutting; of the helicalthread upon the edge of the strip Absolute accuracy of alignment is notessential, a desired function being that the strip 1 which lies in theslot l? shallhe tree to enter the die 48 and engage the thread While thelive spindle 18 is turning. The "function of the chuck is to turn thestrip so that it will automatically be advanced through the die as thethreads or notches are cut in the edge of the strip.

The Wire or conductor is fed -from a suitable spool or reel 54: throughan adjustable guide member 55, under a tensioning and guiding spring 56and from there upon the 1 at a point just beyond the die as. 'iction ofthe strip 1 in the die l8 tends d the strip relatively rigidly and thestrip is furthermore guided by the slot 4'? in the chuck The spool orreel 54 is mounted upon an arm 58 secured at its lower end to the frameplate ll and having a suitable tensioning spring 59 Which is adjustableby the Wing nut t to apply a suitable hraking or tensioning of pressureto the end of said spool or reel 5 lfor the purpose of maintaining thedesired tension upon the conductor or Wire 55.

Since the strip 1 is relatively thin and it is desired to Wind theconductor upon it as rapidly as possible, it is essential that theirregularities of Winding speed be taken up by the spring 56,

As indicated in Figures 13 and 1.4 it will be seen at once that thestrip 1 as it rotates about its axis will talre up the conductor at avarying linear speed which should vary in accordance with the sine lawassuming the strip 1 to be of no thickness and the Wire 55 to be a mereline. i /"hen the flat -face of the strip 1 and-Wire 55 are-tangent, asindicated in Ill, the speed of Winding is a minimum hut increases andrises to a maximum at the position shown in Fig. 13 which is advancedand then the speed dies down again as position of 180 motion is reached.Thus the linear speed of the conductor 55 approaches the sine law orvariation somewhat as indicated by the solid line in the graph of Fig.

Since the notches which are out in the surface of the strip 1 areseparated hy the regular pitch distance as indicated in Fig 8, and sincethere is no guiding function of that part of the cylinder which isindicated by the dotted ellipse in 8 it will be seen at once that theproblem of taking up the irregularities of surface speed due to Windingon a flat strip and also the problem of guiding the Wire into the nextadjacent slot is relatively complex. 1 find, however, that the guidingspring 56, when supplemented by suitable tension on the drum or reel 54and by suitable pcsitioningol the guide $1 perterms this function loytaking up slack during the eriod of relatively low surface speed and atthe same time throwing the Wire over to the right as viewed in 2, tobring the Wire or conductor into the next adjacent notch or part thehelical groove.

Attention is here called to 9 and '10 which illustrate the dill'erencebetween the strip 1 With the Wire Wound tight thereupon, and the strip 1with a round helix Wire surrounding; the same. Assume that the strip 1were supplemented as indicated by the shaded portion 83 and 64 in Fig.9., and that the helical groove were formed upon the cylindrical surfacethereof, it will be seen at once that the Wire conductor 55 would beself guiding upon the surface thereof, and the pound function of takingup the individual irregularities caused by the deviation of the crosssection of strip 1 from the cross section of a true circle to thecircular cylinder and throws the wire over into the next notch duringsuch period of taking up slack so that the wire is carefully guided andsuitably tensioned into its slot with the result that the strip whencompleted has the conductor 55 firmly imbedded in the edges so that thecontact arm, such as the arm 3 as indicated in Fig. 7 or any othercontacting arm whether engaging along the edge or along the sides, isable to press firmly against the turns or convolutions 2 withoutdisplacing them.

In Figures 11 and 12 I have indicated the strip 1 with the conductor 55mounted thereupon. The strip 1 as indicated in Fig. 11 is of a materialwhich permits a sharp V-shaped notch to be cut therein, as is the casein material which is of a crystalline character, such for instance ashard rubber or bakelite. In Fig. 12 I have indicated the character ofthe notch which is the result of cutting fibrous material with the usualthread cutting die, a notch 66 tending to close up but forming asuitable seat for the conductor 55.

The operation of the machine shown in Figs. 1 to 6 inclusive is asfollows: The bare strips 1 which are of the length substantially inexcess of the length of the chuck 32 are inserted in the opening 47while the chuck and live spindle are stationary. At this time the livespindle 18 is thrown as far as possible to the left as viewed in Fig. 5,bringing the clutch member 20 to the left and engaging the surface ofthe same against the side of the bearing pedestal 14. The springs 61which are placed between the two chuck parts tend to maintain the twoparts out of contact when the pedal rod 4:1 is pulled down. Whenpressure is now released on the pedal and the spring 40 permitted toact, the collar 29 throws the live spindle 18 to the right, engaging theclutch surfaces 22 and 23 and driving the live spindle with itscontained chuck. The chuck 32 in turn turns the strip 1 and by pressureupon the rear end of the strip the strip is advanced ihto the teeth ofthe die 48 whereupon the strip automatically advances until the endthereof rotrudes from the die 48. As soon as the ole 66 sufiicientlyclears the die 48 the conductor 55 is thrust therethrough and givensuficient of a hitch to start the winding of the conductor upon thestrip. The conductor is then looped under the guiding and tensioningspring 56, the clutch pedal is released and the winding proceedsautomatically. As soon as the rear end of the strip 1 clears the chuck32, winding automatically stops. The conductor is then cut and loopedthrough the corresponding opening 66in the opposite end of the strip, orif desired, the attendant may feed the next strip through and merelytransfer the wire without cutting from one strip to the advancing end ofthe next.

In order to facilitate the continuous feed ing of the strip I formnotches such as shown at 67 in the ends of the strip and then it ispossible by the engagement of these notches with each other, for thenext succeeding strip, to turn the strip which is issuing from the dieto clear it of the die.

The operation is therefore almost wholly automatic and a singleattendant with one of these machines can do as much work as washeretofore accomplished by three or four ma chines of the prior art eachwith an attendant.

While the machine shown in Figs. 1 to 6 inclusive is the preferreddevice for winding the strips I do not intend to be limited to. the

specific embodiment there shown except in,

such claims as are limited thereto. The broad aspect of the inventioncomprises utilizing the rotation of the strip which is essential towinding upon it the wire 55, to perform at the same time an automaticadvance of the strip may be embodied in other machines. For example Ihave shown in Fig. 16 howI may employ a stationary nut or hollow leadscrew 70 and wormwheels 71 for converting the rotation of the chuck 7 2and strip 1 into a longitudinal feeding motion of strip 1.

In this construction chuck 7 2 is formed of two halves just as chuck 32above shown. This chuck has however the two feeding rollers 71journal-ed on pins 73 in the chuck.

The feeding rollers are provided with teeth which mesh with the threadsof the nut 70 and which on their inner sides engage the strip 1 betweenthem. This strip is guided and turned by the axial channel or slot inthe chuck 72. p

Relatively deep notches may be cut into the edge of the strip 1 asindicated in Fig. 17 and these cross sections may have a lay orinclination greater than the normal lay of a helix by employing a cutter75 on the same shaft or secured to the driving wheels 71 which mesh withthe threads of the nut 70. This cutter 7 5 which acts as a feedingroller may cut any form of notches desired. The strip may be notched onone edge only if desired or an idler as shown at 7 6 may be employed forengaging the other edge.

If the grooves 77 have a greater overlap as shown in Fig. 17 the passageof a contactor over them is smoother and less abrupt.

The machines shown in Figs. 16 and 18 provide support of the stripbeyond the point where the notches or grooves are formed.

I do not intend to be limited to the precise details shown or described.

I claim:

revolvable member, a clutch for clutching the chuck to the member, athread cutting die at' the end of the chuck, and means for supplythe endof the chuck, means for supplying a 4 wire to be wound sutomaticollyupon the strip issuing from the cutting die and tensloning means iontaking the irregularities of winding speed of the wire due to variationsof tangential surface speed of the rotcting strip.

3. In a device of the class desoiiloed the combination of check forholding a strip cl insulation, means for rotating the chuck, meansoperated by rotation of the chucl for simultaneously advancing the stripaxially and cutting transverse grooves across the edge thereof,

l. ln combination hollow spindle, split chuck adapted to be mounted insaid spindle, said chuck having means for holding a st? of insulation,driving means for the spindle, clutch ioi" clutching the driving meansto the spindle, means operated by rotation of the spindle "forsimultaneously advancing the strip through the chuck axially end forcutting tiansveise grooves across the edge thereof, v

5., lln combination a l'lOllGW spindle, split chuck adapted to icemounted in said c said chuck having means for looldine: of insulation,driving means for the. s

a clutch for clutching the. driving inee'ns the spindle, means operatedby rotationo'l spindle for siuuiltineouslyadvancing the strip throughthe chuck axially and for: c1 ting transverse grooves across the edgetheiw of, and means iore guiding a conductor upon the strip,

1 1. i 1 J K 6. In a device DI clie class cescinoeei, a

. chuck for holding" a strip of insulation, means for rotating thechuck, means for cutting notches in edge of the strip and forsimultaneously advancing the strip and means winding a conductor saidnotches as the strip is adv need,

7. In combination, chuck for holding strip of insulation, means forrotating the chuck, notch forming means for advancing the strip as thechuck rotates, means supplying s conductor to be wound upon the str pand means for guiding the conductor into said notches 8. In combination,a trance comprising a pair of bearings, a live spindle mounted i. thebearings, a driving pulley mounted on said spindle between the bearings,s clutch for connecting the pulley with the spindle,

clutch having throw-out means, a relatively stationary die mounted onthe frame and a split chuck mounted in the spindle for rotating a stripin cooperation with the die.

9. In combination, a frame comprising a pair of bearings, a live spindlemounted in the live spine tlieliearings, a driving pulley mounted onsaid spindle between the bearings, a clutch for connecting the pulleywith the spindle, said clutch lieving throwout means, a relativelystationary die mounted on the frame and o split cliuck mounted in thespindle for rotetin strip in cooperation with the die, and Winesupplying and guiding means for guiding the wire upon the strip as itemerges from the die,

10. In combination, frame having bearlive spindle having a chuck torrototing strip of insulati on, means for driving lie at will andstationary means cooperating with the chuck to form notches of groovesecioss the edges of the strip end to sdvcnce the strip through thechuck,

ll. combination, a frame havins beargs, live spindle leaving a chuck torrotating e p of insulation, means for driving 'le at will and stationarymeans tl e live soil c cooperating with the chuck to form notches orcoves across the edges of the strip and to the strip through the chuckand means for supplying and guiding s conductor upon the strizo as itadvances axially.

l2. conibination, frame having two foeerings, a hollow spindle in thebearings, a loose pulley having it cone clutch socket and Keyed coneclutch mounted on said spindle, ns for shifting said spindle axially t0ng cone into the clutch socket of the pulley, acliuclz mounted in thehollow spindle for rotation therewith, and a threading die in front ofthe chuck mounted upon the 13. In combination, a rotatable chuck forfeeding strip of insulation, a stationary threaded member and a wheelcarried by the chuck and engaging the threaded member for strip out ofthe chuck as the oat-ed,

.Ln co ination, rotatable chuck for feeding a strip of insulation, astationary threaded member and s Wheel carried by the chuck and engagingthe threaded member for cdvanc g the strip out of the chuck as the chuckis no steel, and relatively stationary wire feedir means for feding wireto be sound upon the strip as it emerges from the chuck,

111 an apparatus for mounting a conductor supporting element, a cuttintool, means for rotating the element an simultaneously advancing itaxially in engagement the cutting tool, the said tool defining a groovetherein, and means for causing the conductor to be wound upon theelement by the rotation of the same, the said conductor to longitudinalaxis in contact with the said tool and for simultaneously advancing thesame to cause the said tool to cut a transverse groove on its surfacetangent with the said tool, means for causing the conductor to be woundupon the element by the rotation of the said element, and meansmaintaining a tension upon the said conductor for align' ing theconductor with the groove formed on the said element.

17 In an apparatus for mounting a conductor upon a supporting strip, acutting tool, means for rotating the strip upon its longitudinal axis,means for moving the strip in contact with the said tool, the said toolgripping the edges of the strip to form transverse grooves thereon, andmeans for causing the conductor to be wound in the grooves formedthereon by the rotation of the said strip.

18. In an apparatus for mounting a corn ductor on a supporting element,means f or supporting the element for rotation upon its longitudinalaxis,-means for rotating the element, a grooving tool, means foradvancing the element axially in contact with the sald grooving tool toform tangential grooves therein, and means for causing the conductor tobe wound in the tangential grooves by the rotation of the said element.

19. In an apparatus for mounting a conductor on a supporting element ofinsulation, 2. cutting member, means for advancing the element incontact with the said member to form a thread on the element, and meansfor winding the conductor in the thread so formed by the rotation of theelement with respect to the conductor.

20. In an apparatus for mounting a strand on a supporting element, aforming member, means for rotating the supporting element on itslongitudinal axis in tangential contact with the forming member and forsimultaneously advancing the element to cut a helical groove on atangent surface thereof, means for causing the strand to be wound uponthe element by the rotation of the said element, and means formaintaining a tension upon the strand for causing it to align with thehelical groove. I

21. In an apparatus for mounting a strand upon a supporting element, aforming member, means for rotating and advancing axially the element intangential contact with the said member to form diagonal notches acrossa longitudinal-surface of the element, and means for laying the strandin said notches as the element advances.

22. In an apparatus for mounting a strand upon a supporting element, ahelical thread cutting member, means for rotating the element in contactwith the member to cause on the said element, and means for guiding thestrand into the said groove to cause it to be wound on the element.

23. In an apparatus for winding a conductor upon a core of non-circularcrosssection, a thread cutting die, means for threading the core throughthe said die by rotation, the said die forming a groove in the saidcore, means for causing the conductor to be wound upon the core by therotation thereof, and means for maintaining a predetermined tension uponthe conductor to cause it to seek the groove and to be spaced thereby.

24. The method of mounting a strand on a supporting element whichconsists in rotating the element on its longitudinal axis, advancing theelement axially to cut a plurality of grooves therein, andsimultaneously guid ing the strand into the said grooves as the elementis advanced.

25. The method of mounting a strand on a supporting element whichconsists in forming a circumscribing thread upon the element andsimultaneously winding the strand in the groove of said thread.

26. The method of mounting a conductor on a supporting element ofinsulation which consists in rotating the element to wind the conductoron the element and simultaneously forming grooves on a surface of theelement in advance of the application of the conductor thereto forreceiving the said conductor.

27. The method of mounting a conductor on a supporting element whichconsists in rotating the element on its longitudinal axis, cutting agroove therein and simultaneously advancing the element axially andwinding the conductor in the groove by the rotation of the element.

28. The method of mounting a strand upon a core of non-circularcross-section which comprises threading the core longitudinally,applying tension to the said strand to guide it into the grooves oi? thethread so formed, and simultaneously winding the strand around the corein the said grooves.

29. The method of mounting a conductor on a core of non-circular crosssection which consists in forming a plurality of grooves on the edges ofthe said core and contemporaneously causing a relative movement betweenthe core and the conductor to cause the conductor to be wound around thesaid core,

the said grooves receiving the conductor and causing the convolutionsthereof to be uniformly disposed around the core.

30. The method of mounting a conductor on a core of insulation ofnon-circular crosssection which consists in threading the core to causeits edges to have formed thereon a plurality of grooves,contemporaneously causing the conductor to be wound about the core, andapplying tension to the said conductor to uide it into the groovesformed on the sai core, the said grooves receiving the conductor andcausing the convolutions thereof to be uniformly disposed around thecore.

31. The method of mounting a strand on a supporting element whichconsists in threading the element, contemporaneously advancing theelement axially by said threading action and guiding the strand in thegrooves of said thread.

32. The method of mounting a strand on a supporting element whichconsists in rotating the element to cause it to be threaded,contemporaneously advancing the element axially by said threading actionand guiding the strand in the grooves of said thread.

33. In an apparatus for mounting a strand on a supporting element, acutting member for forming grooves in the element and simultaneouslyadvancing it axially, and means for guiding the strand in the saidgrooves as the element is advanced to cause it to be wound on the saidelement.

3%. In an apparatus for mounting a strand on a supporting element, meansfor rotating the said element, a cutting member for contemporaneouslyadvancing the element axially and for forming channels therein, andmeans for guiding the strand in the said channels of the rotatingelement to cause it to be wound on the said element.

35. A winding device having, in combination, means to rotate a member tobe wound, a body having a plurality of spaced cutting edges adapted tobe pressed onto the rotating member at an angle thereto, and guidingmeans on said body for the material being wound on the member.

36. A winding device having, in combination, means to rotate a member tobe wound, a body having .a plurality of spaced cutting edges adapted tobe pressed onto the rotating member at an angle thereto, means tomaintain said body on the member with the cutting edges in fixed angularrelation to the rotating member, and guiding means on said body for thematerial being Wound on the member.

37. "A winding device having, in combination, means to rotate a memberto be wound helically with a fine strand, and a guiding body with aportion thereof in the form of a halt nut having its semi-cylindricalgroove adapted to fit over said member, the threads of the nut enteringinto the material of the member to cause relative axial movement betweenthe body and the member to be wound during the rotation of said member.

38. A winding device having, in combination, means to rotate a member tobe wound, and a guiding body in the form of a halt nut having itssemi-cylindrical groove adapted to fit over the member, the threads ofthe nut cutting into the material of the member to cause relativeadvancement between the body and the member during the rotation of saidmember, said body having a guideway to receive and feed the material tobe helically wound on the member.

39. A Winding device having, in combination, means to rotate a member tobe wound, and an independent body in the form of a nut section havingits arcuate groove adapted to fit over said member, there being aguideway on said body for the material being wound, the threads of thenut being adapted to cut into the material of the member during therotation thereof whereby relative axial advancement between the body andsaid member is produced to feed the material being wound to said memberto produce a helical winding thereon.

40. A winding device having, in combination, means to rotate a member tobe wound, a body having an arcuate cylindrical groove therein adapted tofit over the member being wound, said groove having portions of helicalthreads therein adapted to cut into the material of the member beingwound to cause relative advancement between the member and said bodyduring the rotation of the member, and guiding means on said body toreceive the material being wound on the member.

41. A winding device having, in combination, means to rotate a member tobe wound, a body having a groove therein to fit over said member forguiding the member axially with respect to the body, spaced cuttingedges within said groove at an angle to the rotating member, and guidingmeans on said body for the material being wound on the member.

42. In a winding machine, a chuck rotatable about an axis and having aslot of a section to receive a member upon which a winding is to beplaced, said slot extending through said chuck rectilinearly along theaxis of the chuck and having an inlet at one end and an outlet at theopposite end and in axial alignment with said inlet, means fordelivering a winding to the member for winding thereon by rotation ofthe chuck, and means having positive pushing engagement with said memberand including a threaded element having an axis generally parallel withthe axis of rotation of said chuck for positively pushing said member ina straight path along the axis of rotation of the member to distributethe winding along the member.

In witness whereof, I hereunto subscribe my name this 28th day of July,1924.

CHARLES HAVLISH.

